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Addition-cure silicone rubber IOTA LSR 3M20-306L is an addition-cure silicone rubber specifically for dough kneading mats, featuring excellent flowability, food-grade status, good adhesion to substrates, and high strength. When selecting it, first confirm the state of the A/B components, the mixing ratio, and the catalyst conditions, then evaluate post-cure performance. Merely seeing the words "food-grade addition-cure silicone rubber" is not enough to decide whether it can be used on an existing production line.
This article focuses on procurement and sampling for dough kneading mats and other knife-coating and dip-coating products: products all called addition-cure silicone rubber differ greatly in the viscosity of Component A and Component B, and the mixing ratio, color addition sequence, and platinum catalyst conditions all affect application and curing. Before requesting a quote, clearly state the equipment, substrate, and film-thickness conditions; this reduces the risk of receiving samples that cannot be applied.
Addition-cure silicone rubber, condensation-cure silicone rubber, and silicone resin are different product categories. Condensation-cure silicone rubber has a different curing mechanism; silicone resins often serve as film-forming or bonding components; addition-cure silicone rubber such as IOTA LSR 3M20-306L is delivered as A and B two-component forms, cures via platinum-catalyzed addition reaction, and forms a translucent elastomer after curing. Actual formulations still depend on component composition and reactive groups; products cannot be directly interchanged based on name alone.
IOTA LSR 3M20-306L is a platinum-catalyzed product; the platinum catalyst is in Component A, and strict attention must be paid during use to avoid catalyst poisoning. Before sampling, confirm the respective states of Components A and B, the mixing ratio, and the color addition method.
| Delivery Form | Confirm Before Sampling | Conditions Easily Overlooked When Switching Materials |
|---|---|---|
| Component A (contains platinum catalyst) | Color (transparent), viscosity (1000 mPa·s, 23°C, after stirring) | Avoid catalyst poisoning; cleanliness of containers and tools |
| Component B | Color (translucent or slightly yellow), viscosity (65000 mPa·s, 23°C, after stirring) | Color must be added to Component B and stirred uniformly |
| A+B mixed system | Mixing ratio (by weight A:B=2:100), mixed viscosity (60000 mPa·s, 23°C, after stirring) | Mixing sequence, defoaming, and pot life |
This table is intended for organizing sampling documents and cannot serve as a formulation for equivalent substitution among different systems. When comparing price and addition level, normalize to a comparable mixing-ratio basis and check the test methods in each document.
IOTA LSR 3M20-306L has excellent flowability: Component A viscosity 1000 mPa·s, Component B viscosity 65000 mPa·s (23°C, after stirring), and mixed viscosity 60000 mPa·s (23°C, after stirring). It has good adhesion to substrates and is typically used as a dedicated adhesive for dough kneading mats and other knife-coating and dip-coating products. These data can be used to screen sampling directions but cannot directly serve as acceptance results for a customer's finished part.
Application method and application name only indicate the applicable direction. For an actual product, the compatibility of the rubber compound with the substrate, color paste, and additives must also be checked. If strength and elasticity are required, hardness, tensile strength, elongation, and tear strength should be tested together, avoiding material selection based on a single hardness indicator.
The mixing ratio (by weight) of Components A and B is A:B=2:100, and completion of the specified curing program are two different judgment items. If color is required, it must be added to Component B, stirred uniformly, and then mixed with a measured amount of Component A. The specific program should follow the technical data of the selected product.
During sampling, record the mixing ratio, viscosity after stirring, ambient temperature, and curing time. The mixing ratio only reflects the formulation control condition; whether large or thick parts can meet process requirements should be verified against actual curing records. Do not directly transfer the mixing ratio or curing conditions of another model to a new material. Also note that the platinum catalyst is in Component A, and strict attention must be paid during use to avoid catalyst poisoning.
| Working Conditions to Provide | What Must Be Clearly Stated | Corresponding Verification |
|---|---|---|
| Substrate and pretreatment | Dough kneading mat substrate or other knife-coating/dip-coating substrates; cleaning and surface treatment | Adhesion, appearance |
| Application and film thickness | Knife coating/dip coating or other application methods; wet or dry film thickness range | Leveling, bubbles, missing adhesive |
| Mixing and curing equipment | A:B mixing ratio (2:100), viscosity after stirring, ambient temperature and curing time | Curing state and performance reproducibility |
| Service environment | Food contact, continuous or intermittent use, cleaning method | Food-grade compliance and required media resistance |
| Functional requirements | Whether it serves functions such as food-grade status, high strength, high elongation | Verify according to actual part and service environment |
For statements such as food-grade status and high strength in product introductions, the test object, method, formulation, and judgment criteria must be checked before use. Test results for the base rubber, experimental sheets, and the customer's complete part should be recorded separately.
First fix the substrate, pretreatment, and existing application conditions, and list the acceptance items that must be met (adhesion, hardness, tensile strength, elongation, tear strength, etc.).
Request the TDS and SDS of candidate rubber compounds from the supplier, and check the A/B component states, mixing ratio (2:100), color addition method, and curing program; if information is insufficient, complete it first—do not presuppose a model.
Sample using the same substrate and comparable film thickness, and keep records of formulation, batch, mixing, and curing; note that the platinum catalyst is in Component A, avoid catalyst poisoning, and color must be added to Component B, stirred uniformly, and then mixed with a measured amount of Component A.
Check initial appearance and adhesion, then arrange food-contact, strength, or media-resistance testing according to the application. Write the test conditions and pass thresholds into the sampling confirmation sheet.
Is IOTA LSR 3M20-306L single-component or two-component?
It is an A/B two-component addition-cure silicone rubber with a mixing ratio (by weight) of A:B=2:100, curing via platinum-catalyzed addition reaction.
Can color be added directly to Component A?
No. If color is required, it must be added to Component B, stirred uniformly, and then mixed with a measured amount of Component A.
Why must catalyst poisoning be avoided?
The product uses platinum catalysis, and the platinum catalyst is in Component A. Strict attention must be paid during use to avoid catalyst poisoning; containers, tools, and contact materials should all be kept clean.
What is the viscosity after mixing?
Component A viscosity is 1000 mPa·s, Component B viscosity is 65000 mPa·s, and the A+B mixed viscosity is 60000 mPa·s (all at 23°C, after stirring, ISO3219).
Which indicators should be checked for post-cure performance?
After curing it is translucent; hardness (Shore A) 40 (DIN 53505), tensile strength ≥6 MPa (DIN 53504), elongation ≥300% (DIN 53504), and tear strength ≥10 KN/m (ASTM D624B). These should be verified against the specific part and service environment.
What information should be provided at minimum when requesting a quote?
Provide the substrate, pretreatment, application method, target film thickness, mixing and curing equipment, and service conditions, and list acceptance items (adhesion, hardness, tensile strength, elongation, tear strength, etc.). This information is more helpful for screening samples than asking only for a hardness number.
IOTA LSR 3M20-306L Addition-Cure Silicone Rubber for Dough Kneading Mats: for preliminary verification of the A/B two-component form, 2:100 mixing ratio, and platinum-catalyzed curing direction. The specific formulation depends on the substrate, application method, film thickness, and curing conditions.
